drivers/usb/serial/navman.c

   1 /*
   2  * Navman Serial USB driver
   3  *
   4  * Copyright (C) 2006 Greg Kroah-Hartman <gregkh@suse.de>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      version 2 as published by the Free Software Foundation.
   9  *
  10  * TODO:
  11  *      Add termios method that uses copy_hw but also kills all echo
  12  *      flags as the navman is rx only so cannot echo.
  13  */
  14
  15 #include <linux/gfp.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/tty.h>
  19 #include <linux/tty_flip.h>
  20 #include <linux/module.h>
  21 #include <linux/usb.h>
  22 #include <linux/usb/serial.h>
  23
  24 static bool debug;
  25
  26 static const struct usb_device_id id_table[] = {
  27         { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
  28         { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */
  29         { },
  30 };
  31 MODULE_DEVICE_TABLE(usb, id_table);
  32
  33 static void navman_read_int_callback(struct urb *urb)
  34 {
  35         struct usb_serial_port *port = urb->context;
  36         unsigned char *data = urb->transfer_buffer;
  37         struct tty_struct *tty;
  38         int status = urb->status;
  39         int result;
  40
  41         switch (status) {
  42         case 0:
  43                 /* success */
  44                 break;
  45         case -ECONNRESET:
  46         case -ENOENT:
  47         case -ESHUTDOWN:
  48                 /* this urb is terminated, clean up */
  49                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
  50                         __func__, status);
  51                 return;
  52         default:
  53                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
  54                         __func__, status);
  55                 goto exit;
  56         }
  57
  58         usb_serial_debug_data(debug, &port->dev, __func__,
  59                               urb->actual_length, data);
  60
  61         tty = tty_port_tty_get(&port->port);
  62         if (tty && urb->actual_length) {
  63                 tty_insert_flip_string(tty, data, urb->actual_length);
  64                 tty_flip_buffer_push(tty);
  65         }
  66         tty_kref_put(tty);
  67
  68 exit:
  69         result = usb_submit_urb(urb, GFP_ATOMIC);
  70         if (result)
  71                 dev_err(&urb->dev->dev,
  72                         "%s - Error %d submitting interrupt urb\n",
  73                         __func__, result);
  74 }
  75
  76 static int navman_open(struct tty_struct *tty, struct usb_serial_port *port)
  77 {
  78         int result = 0;
  79
  80         if (port->interrupt_in_urb) {
  81                 dev_dbg(&port->dev, "%s - adding interrupt input for treo\n",
  82                         __func__);
  83                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
  84                 if (result)
  85                         dev_err(&port->dev,
  86                                 "%s - failed submitting interrupt urb, error %d\n",
  87                                 __func__, result);
  88         }
  89         return result;
  90 }
  91
  92 static void navman_close(struct usb_serial_port *port)
  93 {
  94         usb_kill_urb(port->interrupt_in_urb);
  95 }
  96
  97 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port,
  98                         const unsigned char *buf, int count)
  99 {
 100         /*
 101          * This device can't write any data, only read from the device
 102          */
 103         return -EOPNOTSUPP;
 104 }
 105
 106 static struct usb_serial_driver navman_device = {
 107         .driver = {
 108                 .owner =        THIS_MODULE,
 109                 .name =         "navman",
 110         },
 111         .id_table =             id_table,
 112         .num_ports =            1,
 113         .open =                 navman_open,
 114         .close =                navman_close,
 115         .write =                navman_write,
 116         .read_int_callback =    navman_read_int_callback,
 117 };
 118
 119 static struct usb_serial_driver * const serial_drivers[] = {
 120         &navman_device, NULL
 121 };
 122
 123 module_usb_serial_driver(serial_drivers, id_table);
 124
 125 MODULE_LICENSE("GPL");
 126
 127 module_param(debug, bool, S_IRUGO | S_IWUSR);
 128 MODULE_PARM_DESC(debug, "Debug enabled or not");